Nozzle of fluid container and fluid container having the nozzle

ABSTRACT

A nozzle is attached to a tip of a fluid container which is formed of two flexible sheets overlapped with each other. The sheets have their internal surfaces fitted to each other in a normal state after contents are filled into the container such that even a very small portion of contents remaining in the container can be removed by a required amount without coming into contact with air.

TECHNICAL FIELD

The present invention relates to a nozzle of a flexibile fluid containersuch as a tubular-like or a bag-like container adapted to dischargecontents there from by pressing a body of the container, and alsorelates to a fluid container having the nozzle.

TECHNICAL BACKGROUND

Various products such as drinks, cosmetics or adhesives which are packedin tubes or bag-like containers, irrespective of their natures orapplications, have been commercially widespread.

Features which are common to these products packed in a flexiblecontainer are that these products are generally a gel-like fluid, andthese products are incompatible with air upon making contact therewith(anaerobic). That is, should the products make contact with the air,they would be oxidized, deteriorated or hardened.

Features of containers to be packed therein with such anaerobic fluidare such that air should be prevented from being drawn into a containerby a quantity corresponding to a volume of the fluid which has beendischarged from the container, and accordingly, a tube or a bag-likecontainer which can be deformed itself, depending upon a remainingquantity of its contents, has preferably been used. A conventionalcontainer of this kind has been composed of a charging part made of aflexible material, and a nozzle part made of a hard material and coupledto the charging part.

Further, since a body of the container is flexible, if a force exertedto the body of the container is released therefrom after contentsthereof are discharged therefrom, an interior pressure of the body ofthe container becomes slightly negative since this container is torestore to its original shape. Accordingly, there may be such a featurethat contents thereof are drawn through a tip of the nozzle.

Accordingly, a cap of the nozzle is formed in its inner bottom part witha protrusion for making up for a space defined by contents drawn fromthe tip of the nozzle.

However, an anaerobic substance is oxidized at once over its surface soas to start deteriorating when it makes contact with air even for ashort time and though it quantity is small. If the substance does notdeteriorate at an inner portion thereof, although it does at its surfacewhich makes contact with the air, the substance can be used a next timeby removing such a deteriorated part therefrom. However, it is usualthat deterioration progresses to an inner portion of the substance andpropagates in its entirety within a container.

Further, with repetition of removal of a deteriorated part severaltimes, a quantity of the substance to be discarded becomes considerable.If the substance is expensive, it causes a serious problem.

Thus, there has been such a demand that contents are allowed to makecontact with air only by a required quantity, and further, the contentsare extracted by the required quantity, and are prevented from makingcontact with the air.

Accordingly, the present invention is devised in order to solve theabove-mentioned problems, and accordingly, an object of the presentinvention is to provide a nozzle for a fluid container, which allowscontents of the container to be extracted by a required quantity,completely without making contact with air even though a small amountthe contents remains in the container, and to provide a fluid containerincorporating such a nozzle.

SUMMARY OF THE INVENTION

According to the present invention, there is provided a nozzle for afluid container, characterized in that

(1) the nozzle, provided at a front end of a fluid container, iscomposed of at least two flexible sheets which are superposed with eachother, and which are designed such that their inner surfaces are closecontact with one other in a normal state after contents are charged;

(2) the nozzle, provided at a front end of the fluid container, iscomposed of at least two flexible sheets which are superposed with eachother, and which are designed such that their inner surfaces are inclose contact with one other in a normal state after contents arecharged, and further, close contact at an upstream side of the nozzle isreleased by contents being expelled toward the nozzle by an internalpressure of the container, but a degree of the close contact becomeshigher at a leading end part of the contents since at least one of theflexible sheets constituting the nozzle is bent at this part, therebyinhibiting contents from flowing out of the nozzle;

(3) at least one of the flexible sheets constituting the nozzle isformed at a desired position thereof with a border line serving as acrease;

(4) a hardness of the flexible sheets constituting the nozzle isdifferent between an upstream side and a downstream side of the crease;

(5) a thickness of the flexible sheets constituting the nozzle isdifferent between the upstream side and the downstream side of thecrease,

(6) close contact portions of the sheets are curved in their normalstate in a three-dimensionally curved surface-like manner;

(7) close contact portions of the sheets are rolled in their normalstate;

(8) close contact parts of the sheets are bent in their normal state;

(9) of the flexible sheets, a curved sheet or a sheet on a bendingdirection side is further provided on its inner side with an elasticmember for forcing this sheet to curve or bend, and the flexible sheetsconstituting the nozzle are extended along rear surfaces of the elasticmember so as to be in close contact therewith by an elastic force of theelastic member;

(10) the flexible sheets constituting the nozzle are superposed witheach other so as to be formed into a dish-like shape;

(11) at a welded part of the nozzle defining therein a fluid passage,widthwise of the nozzle, a width of the welded part of the nozzle islarger by a desired length on an upstream side of the nozzle than on adownstream side of the nozzle;

(12) at a welded part of the nozzle defining therein a fluid passage,widthwise of the nozzle, after a first welding, welding is againperformed by a clamping force higher than that of the first welding;

(13) a tubular part is formed of a desired length at an upstream part ofthe nozzle;

(14) an upstream part and a downstream part of the nozzle are maderespectively of different materials, and are integrally joined with eachother on one and the same axis;

(15) a manner of joining an upstream part and downstream part of thenozzle is by performing a thermal welding process;

(16) an inner surface of an upstream tubular part of the nozzle issubjected to a non-thermal welding process; and

(17) two passages are formed.

Further, the fluid container according to the present invention ischaracterized by:

(1) in a fluid container composed of a nozzle part and a container bodypart which are integrally incorporated with each other, the nozzle partbeing formed from at least two flexible sheets which are superposed witheach other and are welded to each other along their peripheries, and thenozzle part being characterized by either of the above-mentioned items(1) or (2);

(2) in a fluid container which is formed by flattening a tubular bodymade of flexible sheets of material, and then by welding and cutting aperiphery thereof into a contour shape of the container, a nozzle partbeing characterized by any one of the above-mentioned items (1) to (12);

(3) a nozzle being removably attached to the fluid container or beingintegrally incorporated with the fluid container, stated in any one ofthe above-mentioned items (1) to (17);

(4) the fluid container body being tubular;

(5) the fluid container being a gusset bag;

(6) a member for preventing the flexible sheets from coming into closecontact with each other being provided between the nozzle part and thefluid container part; and

(7) filler port being provided, in addition to the nozzle.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1(a) and FIG. 1(b) are a front view and a side view, respectively,illustrating a first embodiment of the present invention;

FIG. 2(a) and FIG. 2(b) are a sectional views illustrating an essentialpart of the first embodiment;

FIGS. 3(a)-3(d) are views for explaining a method of forming a nozzleand a container body;

FIGS. 4(a)-4(c) are views for explaining operation of the nozzle of thepresent invention;

FIGS. 5(a)-5(c) are views for explaining effects of the nozzle of thepresent invention;

FIGS. 6(a) and 6(b) are views for explaining a method of using thenozzle of the present invention;

FIG. 7 is a view for explaining a method of using the nozzle of thepresent invention;

FIGS. 8(a)-8(e) are views for explaining variation of a shape of thenozzle of the present invention;

FIGS. 9(a)-9(c) are views for explaining a shape of a tip of the nozzleof the present invention;

FIGS. 10(a)-10(c) are views for explaining a curving direction of thenozzle of the present invention;

FIGS. 11(a) and 11(b) are views for explaining a shape of the nozzle ofthe present invention;

FIGS. 12(a) and 12(b) are views for explaining a shape of the nozzle ofthe present invention;

FIGS. 13(a) and 13(b) are views for explaining a shape of the nozzle ofthe present invention;

FIGS. 14(a)-14(c) are views for explaining a method of forming thenozzle and the container body;

FIGS. 15(a) and 15(b) are views for explaining a charging method;

FIG. 16 is a view for explaining a charging method;

FIG. 17 is a view for explaining an example of a configuration of thecontainer;

FIG. 18 is a view for explaining an example of a configuration of thecontainer;

FIG. 19 is a view for explaining an example of a configuration of thecontainer;

FIGS. 20(a) and 20(b) are views for explaining an example of aconfiguration of the container;

FIGS. 21(a) and 21(b) are views for explaining another example ofconfiguration of the container;

FIGS. 22(a)-22(d) are views for explaining a forming method of thenozzle of the present invention;

FIGS. 23(a) and 23(b) are views for explaining an example of attachmentof the nozzle of the present invention;

FIGS. 24(a)-24(c) are views for explaining a using method;

FIGS. 25(a)-25(c) are views for explaining an attaching method;

FIGS. 26(a) and 26(b) are views for explaining an example of aconfiguration of the nozzle with the container;

FIGS. 27(a)-27(c) are views for explaining another example of aconfiguration of the nozzle with the container; and

FIGS. 28(a) and 28(b) are views for explaining another example of aconfiguration of the nozzle with the container.

DETAILED DESCRIPTION OF

THE PREFERRED EMBODIMENTS Explanation will be hereinbelow made ofembodiments of the present invention with reference to the accompanyingdrawings:

FIGS. 1(a) and 1(b) show a first embodiment of a nozzle for a fluidcontainer, according to the present invention, among which FIG. 1(a) isa front view and FIG. 1(b) is a side view.

Referring to the figures, there are shown a nozzle or nozzle body 1, acontainer or container body 2 and a filling port 3, with liquid contentsbeing filled therein. Arrows shown in these figures indicate that thenozzle body 1 has a curved surface shape, that is, a spoon-like shape.

FIGS. 2(a) and 2 b are sectional views illustrating an essential partwithin a dotted line shown in FIG. 1, among which FIG. 2(a) is asectional view along line A—A, and FIG. 2(b) is a sectional view alongline B—B. The container explained in this embodiment is a bag-likecontainer, and is formed of two flexible sheets which are welded to eachother at their outer peripheries, as will be detailed later. The nozzlebody 1 of this fluid container has a right side surface which isdepicted by a continuous line from the container body 2 to a nozzle tipend 4 as shown in FIG. 1(b), while the nozzle body has a left side whichis curved in a part indicated by arrow C. With this curve, two flexiblesheets constituting the nozzle body 1 are made to be in close contactwith each other so as to block contents in the container body 2 in orderto prevent the contents from flowing out.

The fluid container in this embodiment is formed from, for example, amethod as shown in FIGS. 3(a) to 3(d):

At first, (a) two flexible sheets 5 having a desired shape (rectangularshape) are superposed with each other, and (b) are welded at theirperipheries, except a filling opening part 6. During this stage, ashaded part 7 may be cut off, simultaneously with the welding. A nozzletip end 4 is welded but a rear end 6 of the container body is opened inorder to define a filling port 3 in the opening part 6. The filling port3 shown in FIG. 1(a) is a filling port which is formed separately and isthen welded. After filling of the container, the opening part (rear endof the container body) 6 is welded closed.

The nozzle body 1 is curved vertically and horizontally, as shown inFIG. 1(b), and has a curved surface-like shape, that is, spoon-likeshape as a whole. FIG. 3(d) is a side view which shows a condition inwhich no contents are filled into the container body.

It is desirable to weld the nozzle tip end 4 closed when contents arefoodstuffs, particularly in view of a sanitary reason. However, aftercontents are filled, because the nozzle body 1 is curved, a degree ofadhesion is increased between the flexible sheets of the nozzle body 1so that it is difficult for the contents to leak, whereby welding is notalways necessary.

FIGS. 4(a) to 4(c) show the operation of the nozzle body 1 of this fluidcontainer.

In these figures, FIG. 4(a) is a perspective view illustrating acondition in which contents are filled into the container body, andFIGS. 4(b) and 4(c) are longitudinal sectional views of the nozzle body.

In a normal state, when the container body 2 is pressed by a finger orthe like (point D) so as to increase internal pressure, contents in thecontainer body 2 are pushed toward the nozzle 1. Although the nozzle 1had been curved or bent (i.e. made non-planar) at point C at a time offilling contents into the container body, as shown in FIG. 4(b), a partE shown in this figure bulges out due to internal pressure of thecontainer, and as a result, the nozzle is further curved or bent atpoint C. Thus, the two flexible sheets constituting the nozzle 1 tightlyadhere to each other, and are further curved or bent in order to holdsuch a condition that a passage between the two flexible sheets isautomatically blocked, whereby it is possible to prevent contents fromflowing out of the nozzle.

At this time, by depressing the part E shown in the figures with afinger or the like, curvature or bending of the nozzle 1 at point C isdecreased, and accordingly, the passage is ensured so that contents flowinto the nozzle tip end 4.

A principle utilized by the present invention will be explained asfollows:

The above-mentioned operation will be explained in detail with referenceto FIGS. 5(a) to 5(c).

The container body 2 is planar when it is empty, and after contents arefilled therein, the container body is formed into a substantiallytubular shape. When part D of the container body is pressed so as toincrease internal pressure thereof, the container itself is deformedinto a cylindrical shape, and then into a spherical shape. Accordingly,the nozzle 1 which has already been curved or bent at point C isincreased with regard to its curvature or bending at point C.

The nozzle of the fluid container according to the present invention, isone for which a cap is not necessary.

Next, explanation will be made of a method of using the containerincorporating the nozzle according to the present invention.

As shown in FIG. 6(a), the nozzle tip end 4 is at first cut, and asshown in FIG. 6(b), a fluid passage in the nozzle 1 is taper-like, beingblocked at a forward portion, and accordingly, a cutting position ischanged in order to obtain an opening area, depending upon a requireddischarge rate.

In order to discharge contents, at first, as shown in FIG. 4(b), thecontainer body 2 is depressed by a finger or the like so as to increaseinternal pressure of the container body. When joint base part E of thenozzle 1 is depressed by another finger, thicknesswise of the container,contents stretch a curve or bend of the nozzle at point C, andaccordingly, the contents force the passage to open by itself while thecontents are pushed toward the nozzle tip end 4. After contents aredischarged by a substantially required quantity, contents in the nozzle1 are squeezed out by a finger, a spatula 8 as shown in FIG. 7, or thelike.

Contents in the nozzle 1 may be, of course, pushed back into thecontainer body 2 without a volume of these contents being discharged inits entirety.

As mentioned above, by expelling residual contents from the nozzle 1,the sheets come into close contact with each other so as to effectsealing, and accordingly, no air flows into the nozzle. Thus, contentsremaining in the container body 2 are completely prevented from makingcontact with air, whereby it is possible to prevent the contents frombeing deteriorated, that is, being oxidized or discolored.

Only for this reason, since contents in the nozzle 1 can be thoroughlydischarged so that the two flexible sheets 5 constituting the nozzle 1make contact with each other, no contents are discharged while noambient air enters the nozzle. Further, it is better to slightlyincrease internal pressure of the container body in order to enhancecurvature of the nozzle by depressing the container body 2, as shown inFIG. 4(b).

It is noted that, as shown in FIGS. 6(a) and 6(b), a welding width 9 islarger in an upstream part of the nozzle than in a downstream part (tipend side) of the nozzle, and accordingly, deformation of a containeredge part 10 extending toward part E shown in FIG. 5a becomes greater byenhancing rigidity of that edge part to intensify a force exerted topoint C so as to enhance its curvature while deformation of the nozzle 1caused by depressing point E, in order to discharge contents, becomessmooth so as to allow discharge of the contents to be easier.

Further, after the two flexible sheets 5 constituting the nozzle 1 arewelded, widthwise opposite ends are again welded, as shown in FIG. 3(c),by a clamping force which is greater than an initial force so thatrigidity of the nozzle 1 is enhanced in its entirety, and accordingly,discharge of contents from the nozzle becomes easier and functional.

FIGS. 8(a) to 8(e) show variations of the nozzle 1 for a fluid containeraccording to the present invention.

FIG. 8(a) shows a variation in which a welding width is constantthroughout the nozzle 1.

FIGS. 9(a)-9(c) and 10(a)-10(c), show variations in which a fluid nozzleis curved. Referring to FIG. 9(a) the tip end 4 is rolled, whilereferring to FIG. 9(b) a tip end is substantially bifolded, andreferring to FIG. 9c a nozzle is clamped in order to completely closethe nozzle. Further, referring to FIG. 10(a) a nozzle is curved only ina widthwise direction thereof, and referring to FIG. 10(b) a nozzle iscurved in a direction of a passage in the nozzle.

Further, a shape of a nozzle is contrivable as follows:

FIGS. 11a and 11 b show a case in which a curving line (crease) 12 hasbeen previously formed at a desired position (a substantially centralposition in this figure). With this arrangement, a curved or bent (i.e.non-planar) condition can be easily maintained even in a normal state.As to a process of forming the curving line 12, there may preferably beused a press method (a so-called press line, that is, hot-pressing orcold pressing). Thus, the crease or curving line 12 is defined by aplastically deformed portion of one of the flexible sheets.

In addition, it may be considered that thickness and hardness (orflexibility) of flexible sheets 5 are different between parts positionedforwardly and rearwardly from the curving line 12 as a border line. Inthis case, it may be considered that an upstream side (a container bodyside) 13 of nozzle 1 is thin or soft while a downstream side (tip endside or close-contact side) 14 of the nozzle is thick or hard.

Further, as shown in FIGS. 12(a) and 12(b), a part positioned forwardlyof the curving line 12 is provided therein with an elastic member 15 forforcing the nozzle to curve or bend inwardly in a tip end part in orderthat the flexible sheets 5 constituting the nozzle 1 are extended whilethey come into close contact with each other. In this case, as to theelastic member 15, a Belleville spring is most preferable. However, theelastic member is not limited to this spring together with materialthereof so long as the elastic member biases the nozzle into anon-planar configuration.

FIG. 13(a) shows a case in which nozzle 1 has been previously formedinto a dish-like shape, and FIG. 13(b) is a sectional view along lineF—F in FIG. 13(a). This case may be combined with the case in whichhardness and thickness are different between parts positioned forwardlyand rearwardly of the curving line 12 as a border line, as mentionedabove. This can enhance a degree of adhesion between flexible sheets 5at the curving line 12, more than when the nozzle merely exhibits aspoon-like shape, whereby it is possible to enhance reliability of thenozzle.

FIGS. 14(a) to 14(c) show another method of forming a fluid containerincorporating the nozzle according to the present invention.

Although two separate flexible sheets 5 are superposed with each otherin the method shown in FIGS. 3(a) to 3(d), container body 2 may beformed by a single flexible sheet 5 which is bifolded as shown in FIG.14(a), or container body 2 may be formed by using a flexible sheet 5which is originally tubular, as shown in FIG. 14(b). FIG. 14(c) is aview which shows a completed container. This method has such anadvantage in that a number of welded parts is less than that in themethod shown in FIG. 3.

It is noted that welding of tip end 4 of the nozzle is not alwaysnecessary, but welding may be performed as necessary in view of a kindof contents.

In all embodiments of the present invention, as to material of flexiblesheet(s) 5 used for nozzle 1 and container body 2, a flexible compositesheet made of synthetic resin is preferably used. Specifically,polyethylene (PE), polypropylene (PP), nylon or the like is preferable.Further, the sheet(s) to be used preferably has a so-called high barrierproperty so as to be excellent in terms of being moisture proof andimpermeable to air or gas.

As mentioned above, a nozzle, such as a filler which is not shown isinserted into container body 2 configured as mentioned above, throughbottom opening 6 which has not yet been welded so as to fill contents,into the container body as shown in FIGS. 15(a) and 15(b), andthereafter, the bottom opening 6 is welded shut.

The nozzle 1 according to the present invention allows contents to befilled while the contents are prevented from leaking from the nozzleeven though the contents are a low viscous fluid such as water. In orderto completely prevent leakage, in view of leakage due to capillaryaction, nozzle tip end 4 may be welded or it may be clamped by aclamping member.

It is noted that since a curve is formed in the nozzle, contents can beprevented from being accidentally discharged from the nozzle even thougha pressure which is generally high is exerted to the container body 2.Further, the greater a pressing of the container for dischargingcontents, the greater a curvature of the nozzle, in view of a certainkind of contents, whereby the contents can hardly be discharged.

FIG. 16 is a front view which shows a third embodiment of the presentinvention.

In this embodiment, a hanging part 16 is incorporated with the bottompart 6 of container body 2 in order to enhance efficiency of filling ofcontents, as mentioned above.

The hanging part 16 is provided with hanging holes 17 for filling thecontainer body 2, and a hanging hole 18 for displaying a filledcontainer body as a commodity. Hanging part 16 may have previously beenintegrally incorporated with sheet 5 of the container body, or hangingpart 16 which has been separately prepared may be incorporated with thebottom part 6 of the container body by virtue of welding or the like.

With this arrangement, when contents are filled, as shown in thisfigure, the hanging holes 17 are inserted onto hangers 19, andthereafter, the hangers 19 are moved toward each other so as to open afilling port 20. Filling nozzle 21 is inserted into the filling port 20for filling contents into the container body 2. Further, after filling,the bottom part 6 is thermally welded.

FIG. 17 shows a fourth embodiment.

As shown in this figure, container body 2 is formed with a filling port23 therein, which filling port incorporates a screw cap 22 or the like,and accordingly, the container body 2 can be used repeatedly. Furtherthe container body may be used as a container having a large volume.

FIG. 18 is a front view which shows a fifth embodiment.

In this embodiment, a pot-type container body is used, which isincorporated with filling port 3 and nozzle 1, which are located at thetop part of the container body 2 and which are directed upwardly.

FIG. 19 shows a sixth embodiment.

Is noted that a gusset bag is used as container body 2 in thisembodiment.

Further, in a case of a large-sized gusset bag, reinforcements 24 may beprovided in welded vertical side parts in order to prevent the containerbody from falling down.

FIGS. 20(a) and 20(b) show a variant form of the embodiment shown inFIG. 19, in which bottom part 6 is formed therein with filling port 3.

FIGS. 21(a) to 27(c) show other embodiments of nozzle 1 according to thepresent invention. Although the nozzle which has been explainedhereinabove is integrally incorporated with a container body, theseembodiments are of a general purpose type, and accordingly, the nozzlethereof may be substituted for a cap of an existing container.

Referring to FIGS. 21(a) and 21(b), nozzle 1 is composed of a tubularpart 25 and a close contact part 26. FIG. 21(a) is a front view of thenozzle while FIG. 21(b) is a side view of the nozzle.

This nozzle 1 is configured as shown in FIG. 22(a) to 22(d). That is, asshown in FIG. 22(a), two flexible sheets 5 which have been cut into adesired shape for preparation, are superposed with each other, and arethen thermally welded at their peripheries, except for lower side partsof the sheets as shown in FIG. 22(b). In this case, the two flexiblesheets are not always essential, and a single flexible sheet, which isbifolded along one side and then thermally welded along its periphery,may also be used so as to form the nozzle.

Referring to FIG. 22(c), which shows a tubular member 25 as an upstreampart, an inner surface of the tubular member 25 is subjected to anon-thermal welding process 27 which is desirable for satin-finishingthe inner surface. That is, with this satin-finishing process,micro-unevenness is formed on the inner surface so thatheat-transmission is extremely lowered, and accordingly, a surface tocome into contact is prevented from being fused (can hardly be fused).It is noted that there may be used another method in which a sheet madeof a material which is different from material of the tubular member 25,and which is not thermally welded, may be held in a hollow part.

Next, the above-mentioned tubular member 25 is inserted into an openingpart 28 of a downstream part 26 which has been previously prepared, andboth are then thermally welded to each other at their parts to bewelded.

As to materials, the upstream part 25 is made of polyethylene (PE) orpolypropylene (PP), and the downstream part 26 is preferably formed of aflexible composite sheet made of synthetic resin which is specificallyand preferably polyethylene (PE), polypropylene (PP), nylon or the like.Further, the sheets 5 to be used preferably have a so-called barrierproperty which is excellent in terms of being water-proof andimpermeable to air or gas.

It is important that when the downstream part 26 is welded, a thicknessof the sheets to be welded, or a tension thereof, during welding issuitably adjusted so as to curve the downstream part 26 in order toobtain a high degree of adhesion between the sheets 5 after welding.Further, as to a curving direction, there may be considered a direction(trough-like shape) orthogonal to a flowing direction as shown in FIG.10(a), a flowing direction (arcuate shape) shown in FIG. 10(b), or aspherical surface shape as shown in FIG. 10(c). However, since thespherical surface shape such as a spoon-like shape can be easilymanufactured, and since a degree adhesion between superposed sheets 5becomes higher for this shape, it is possible to surely prevent leakage.

As mentioned above, there may be considered various methods to causetensions of two sheets to be different from each other in order to allowone of the sheets to shrink, or to press the sheets at such atemperature that the sheets are not welded to each other.

During use of nozzle 1 for container according to the present invention,which is configured as mentioned above, as shown in FIGS. 23(a) and23(b), the tubular member or upstream part 25 may be fitted into adischarge port 29 of container body 2. There may be used, as thecontainer body 2, a bag-like container body such as a stand pouch, inaddition to a tubular container body as shown in FIGS. 23(a) and 23(b),which is made of a flexible material. Material and shape of thecontainer body is not so specifically limited.

Further, a welded part of nozzle tip end 4 is cut off by scissors or thelike so as to open the nozzle tip end 4. Referring to FIGS. 24(a) to24(c), in a normal state shown in FIG. 24(a) when the contents are to bedischarged by depressing container body 2, the contents forces twosuperposed sheets 5 of downstream part 26 to separate from each other sothat contents are discharged from the tip end 4 as shown in FIG. 24(b).Finally, the downstream part 26 is squeezed by a spatula, rollers 30 orthe like so that contents are pushed out from between the sheets 5, andas a result, the two sheets 5 of the downstream part 26 again come intoclose contact with each other in a widthwise direction (trough-likeshape) thereof, a flowing direction (arcuated shape) or in a sphericalsurface shape, as shown in FIGS. 10(a) to 10(c). In this case, thespherical shape can surely prevent leakage since degree of adhesionbetween the superposed sheets 5 becomes higher, as mentioned above.

It is noted here that as to shape of the downstream part, any of thoseshown in FIGS. 8(a) to 8(e) may be used.

Further, the downstream part 26 may not only be curved as mentionedabove, but may be curled as shown in FIG. 9(a), be bent as shown in FIG.9(b), or be clamped at its tip end by a clamping device as shown in FIG.9(c).

Further, as a method of fitting nozzle 1 to container body 2, there maybe used a method of inserting the nozzle 1 into discharge port 29 of thecontainer body as shown in FIG. 25(a), a method of inserting the nozzle1 onto an exterior of the discharge port 29 as shown in FIG. 25(b), anda method of screwing the nozzle onto the discharge port as shown in FIG.25(c). Further, the nozzle 1 may be, integrally welded to the containerbody 2 as in the above-mentioned embodiments.

FIGS. 26(a) and 26(b) are views which show a configuration of anotherembodiment of the present invention.

In this configuration, three sheets 5 are superposed with one another soas to define two passages G, H. This arrangement is effective forsimultaneously discharging two kinds of contents.

In this configuration, if the sheets 5 are formed in a desired shape andarranged parallel to each other, the sheets may be three-folded at theircommon side, and may then be thermally welded at their peripheries so asto form the same shape as mentioned above. Three superposed sheets arenot always essential.

Thus, the two passages are merged in later half K of downstream part 26into a single passage, and further, the sheets are alternately welded soas to define an agitating passage 31. With this arrangement, a two partadhesive or the like may be discharged in a mixed condition at one time.In this case, if adhesive which is squeezed and mixed in the two mergedpassages is discharged in its entirety, then it can be prevented frombeing solidified within the passages.

FIGS. 27(a) to 27(c) show a case that in which a nozzle of thisembodiment is applied to a pot-type container body, a filler portincorporating type container body, or a gusset bag type container body.

FIGS. 28(a) and 28(b) shows a seventh embodiment.

Referring to these figures, there is shown a member 32 for preventingflexible sheets from making contact with each other, which member may bea straw-like tubular member that is diametrically depressed or a planarmember that is bi-folded. This member 32 serves as a buffer and a guidewhen contents are pushed out from container body 2.

That is, nozzle 1 at a front end of the container body is in closecontact in a normal state so that liquid pushed out from the containerbody forces the nozzle to open while the liquid advances through thenozzle. However, a joint base part 33 of the nozzle 1 is likely to bend,and accordingly, the liquid itself advances, forcing the nozzle to openwhile it reforms the nozzle from its bent shape. Thus, resistancebecomes excessively high. If curving of this base part is inconvenient,the above-mentioned member 32 is provided so as to previously open thenozzle in order to allow liquid to smoothly advance therethrough.

Thus, the member 32 should not be limited to the tubular member, and maybe a planar member if its shape can exhibit the above-mentionedfunction.

The nozzle 1 or curving of point C can prevent accidental discharge ofcontents, and accordingly, the member 32 may be incorporated as isnecessary in view of a kind of contents. The member 32 severs as a flowrate adjusting mechanism.

The nozzle for a fluid container and fluid container having the nozzleaccording to the present invention as shown in the respectiveembodiments can basically be used with no cap, and can prevent contentsfrom leaking due to capillary action even though the contents is a lowviscous fluid such as water.

Further, since contents can be prevented from making contact with aireven with no cap, a condition of reservation of a material such as anadhesive, which would be deteriorated through reaction with moisture inair, or foodstuffs which would be oxidized, is extremely satisfactory.Further, contents may be smoothly discharged when the container isreused after storage thereof. Further, with no removal of a cap beingnecessary, the container is convenient.

Further, the nozzle may be optionally combined with any of variousbag-like container bodies including a stand pouch container body and agusset bag container body, in addition to a tubular container body, andaccordingly, use of the nozzle can be widespread. Further, by selectinga material adjusted to contents of the container (in particular, amaterial having a high degree of barrier property is preferable), thenozzle can be used for reservation of liquid in various fields withextreme satisfaction.

INDUSTRIAL USABILITY

Since a nozzle for a container, and a container incorporating the nozzlehave been configured as mentioned above, a required volume of contentscan be discharged while contents remaining in the container afterdischarge can be completely prevented from making contact with air.

Thus, even though a condition of reservation of contents is remarkablysatisfactory, in comparison with a conventional container, the contentstherein cannot be consumed at one time, whereby it is possible toprolong a period of reservation in a useable condition.

What is claimed is:
 1. A nozzle to be provided at a head of a fluidcontainer, comprising: at least two flexible sheets superposed with eachother and welded to each other along peripheral portions thereof so asto define a nozzle body having (i) welded portions that have a greaterwidth on an upstream side of said nozzle body than on a downstream sideof said nozzle body, and (ii) inner surfaces, defined by respectiveinner surfaces of said at least two flexible sheets, that are in contactone with another such that after contents are filled into the fluidcontainer said inner surfaces in contact with each other define a sealso as to prevent leakage of the contents from a downstream end of saidnozzle body, which seal is designed to be broken upon the contents beingforced toward said upstream side of said nozzle body via an internalpressure of the fluid container; and a crease in at least one of said atleast two flexible sheets so as to define a boundary line in said atleast one of said at least two flexible sheets, wherein at least one ofsaid at least two flexible sheets is non-planar prior to the contentsbeing forced toward said upstream side of said nozzle body so as tofurther prevent leakage of the contents from said downstream end of saidnozzle body, and wherein said at least two flexible sheets have ahardness upstream of said crease that is different than a hardness ofsaid at least two flexible sheets downstream of said crease.
 2. Thenozzle according to claim 1, wherein said hardness of said at least twoflexible sheets upstream of said crease is less than said hardness ofsaid at least two flexible sheets downstream of said crease.
 3. A nozzleto be provided at a head of a fluid container, comprising: at least twoflexible sheets superposed with each other and welded to each otheralong peripheral portions thereof so as to define a nozzle body having(i) welded portions that have a greater width on an upstream side ofsaid nozzle body than on a downstream side of said nozzle body, and (ii)inner surfaces, defined by respective inner surfaces of said at leasttwo flexible sheets, that are in contact one with another such thatafter contents are filled into the fluid container said inner surfacesin contact with each other define a seal so as to prevent leakage of thecontents from a downstream end of said nozzle body, which seal isdesigned to be broken upon the contents being forced toward saidupstream side of said nozzle body via an internal pressure of the fluidcontainer; and a crease in at least one of said at least two flexiblesheets so as to define a boundary line in said at least one of said atleast two flexible sheets, wherein at least one of said at least twoflexible sheets is non-planar prior to the contents being forced towardsaid upstream side of said nozzle body so as to further prevent leakageof the contents from said downstream end of said nozzle body, andwherein said at least two flexible sheets have a thickness upstream ofsaid crease that is different than a thickness of said at least twoflexible sheets downstream of said crease.
 4. The nozzle according toclaim 3, wherein said thickness of said at least two flexible sheetsupstream of said crease is less than said thickness of said at least twoflexible sheets downstream of said crease.
 5. A nozzle to be provided ata head of a fluid container, comprising: at least two flexible sheetssuperposed with each other and welded to each other along peripheralportions thereof so as to define a nozzle body having (i) weldedportions that have a greater width on an upstream side of said nozzlebody than on a downstream side of said nozzle body, and (ii) innersurfaces, defined by respective inner surfaces of said at least twoflexible sheets, that are in contact one with another such that aftercontents are filled into the fluid container said inner surfaces incontact with each other define a seal so as to prevent leakage of thecontents from a downstream end of said nozzle body, which seal isdesigned to be broken upon the contents being forced toward saidupstream side of said nozzle body via an internal pressure of the fluidcontainer, wherein said at least two flexible sheets are welded to eachother along peripheral portions thereof by performing a first weldingoperation that utilizes a first clamping force, and then performing asecond welding operation that utilizes a second clamping force that isgreater than said first clamping force.
 6. The nozzle according to claim5, wherein at least one of said at least two flexible sheets isnon-planar prior to the contents being forced toward said upstream sideof said nozzle body so as to further prevent leakage of the contentsfrom said downstream end of said nozzle body.
 7. A nozzle to be providedat a head of a fluid container, comprising: at least two flexible sheetssuperposed with each other and welded to each other along peripheralportions thereof so as to define a nozzle body having (i) weldedportions that have a greater width on an upstream side of said nozzlebody than on a downstream side of said nozzle body, and (ii) innersurfaces, defined by respective inner surfaces of said at least twoflexible sheets, that are in contact one with another such that aftercontents are filled into the fluid container said inner surfaces incontact with each other define a seal so as to prevent leakage of thecontents from a downstream end of said nozzle body, which seal isdesigned to be broken upon the contents being forced toward saidupstream side of said nozzle body via an internal pressure of the fluidcontainer; and an elastic member to bias at least one of said at leasttwo flexible sheets into a non-planar configuration so as to furtherprevent leakage of the contents from said downstream end of said nozzlebody, with said at least two flexible sheets extending along a rearsurface of said elastic member.
 8. The nozzle according to claim 7,wherein at least one of said at least two flexible sheets is non-planarprior to the contents being forced toward said upstream side of saidnozzle body so as to further prevent leakage of the contents from saiddownstream end of said nozzle body.
 9. The nozzle according to claim 8,further comprising: a crease in at least one of said at least twoflexible sheets so as to define a boundary line in said at least one ofsaid at least two flexible sheets.
 10. A nozzle to be provided at a headof a fluid container, comprising: at least two flexible sheetssuperposed with each other so as to define a nozzle body having innersurfaces, defined by respective inner surfaces of said at least twoflexible sheets, that are in contact one with another such that aftercontents are filled into the fluid container said inner surfaces incontact with each other define a seal so as to prevent leakage of thecontents from a downstream end of said nozzle body, which seal isdesigned to be broken upon the contents being forced toward an upstreamside of said nozzle body via an internal pressure of the fluidcontainer; and a tubular portion, having a prescribed width, at anupstream portion of said nozzle body.
 11. The nozzle according to claim10, wherein said nozzle body is of a first material, said tubularportion is of a second material that is different from said firstmaterial, and said nozzle body is coaxially connected to said tubularportion so as to define an integral body.
 12. The nozzle according toclaim 10, wherein at least one of said at least two flexible sheets isnon-planar prior to the contents being forced toward said upstream sideof said nozzle body so as to further prevent leakage of the contentsfrom said downstream end of said nozzle body.
 13. The nozzle accordingto claim 12, wherein said nozzle body is of a first material, saidtubular portion is of a second material that is different from saidfirst material, and said nozzle body is coaxially connected to saidtubular portion so as to define an integral body.